Hello,
I have thought that it would be a good idea to allow the background
position to depend on the first parent with relative or absolute
position, pretty much like the position: absolute; for boxes
Taken from the CSS2.1 spec:
"In the absolute positioning model, a box is explicitly offset with
respect to its containing block."
It can be useful, for example, for menus that do not have a fixed
position but still would have a global background image for the whole
menu. For example with the complexspiral demo example [1], you could
just have a bgimage fixed to the menu.
If we do that, we could as well have a background-attachement:
absolute-scroll, and another absolute-local; that would allow the
scrolling (or not) of the background with the element its position is
based on.
Jordan Osete
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[1] http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html